Constraints on the $U(1)_{B-L}$ model from global QCD analysis

TL;DR

This paper conducts a comprehensive QCD analysis incorporating a $U(1)_{B-L}$ gauge boson, establishing exclusion limits on its coupling for masses between 2 and 160 GeV, with no improvement in fit quality.

Contribution

It provides the first global QCD analysis including the $U(1)_{B-L}$ gauge boson, setting new constraints on its coupling based on high-energy scattering data.

Findings

No improvement in fit quality with $Z'$ inclusion.

Exclusion limits on $Z'$ coupling for masses 2-160 GeV.

Constraints are derived from electron-nucleon scattering data.

Abstract

We perform the first global QCD analysis of electron-nucleon deep-inelastic scattering and related high-energy data including the beyond the Standard Model $U(1)_{B-L}$ gauge boson, $Z'$. Contrary to the dark photon case, we find no improvement in the $\chi^2$ relative to the baseline result. The finding allows us to place exclusion limits on the coupling constant of the $Z'$ with mass in the range $M_{Z'} = 2$ to 160 GeV.